27MnCr5齿轮钢热压缩变形行为及动态再结晶  

Hot compression deformation behavior and dynamic recrystallization of 27MnCr5 gear steel

作　　者：庾桃 刘孟迪 文辉 王开[1] 罗荣 方飞松 张靖翊 YU Tao;LIU Meng-di;WEN Hui;WANG Kai;LUO Rong;FANG Fei-song;ZHANG Jing-yi(School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;Chongqing Jianshe Industry （group） Co Ltd, Chongqing 401320, China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]重庆建设工业(集团)有限责任公司,重庆401320

出　　处：《材料热处理学报》2018年第6期133-139,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金面上项目(51774054)

摘　　要：采用Gleeble-1500热模拟实验机在变形温度为800～1100℃,应变速率为0.1～10 s^-1范围内对27MnCr5齿轮钢进行热压缩实验,研究27MnCr5齿轮钢的动态再结晶行为,构建合金的本构关系和动态再结晶模型,研究变形条件对27MnCr5齿轮钢显微组织的影响。结果表明：变形温度越高,27MnCr5齿轮钢的流动应力越低,动态再结晶体积分数越高;当变形温度升高至1100℃时,晶粒粗化现象很明显,平均晶粒尺寸较大;利用Deform软件对构建的动态再结晶模型进行数值模拟,平均晶粒尺寸误差在20%以内,应力-应变本构关系和动态再结晶模型能较好的预测实验结果。The hot compression test of 27MnCr5 gear steel was carried out by using a Gleeble-1500 thermal simulator in the temperature range of 800-1100 ℃ and at strain rate of 0. 1-10 s^-1,the dynamic recrystallization behavior of the 27MnCr5 gear steel was studied,the constitutive relation and dynamic recrystallization model of the alloy were established,and the effect of deformation conditions on microstructure of the 27MnCr5 gear steel was studied. The results show that the flow stress of the 27MnCr5 gear steel decreases and the volume fraction of dynamic recrystallization zone increases with the increasing of deformation temperature. When the deformation temperature rises to 1100 ℃,the grain coarsening is obvious,leading to a large average grain size. The dynamic recrystallization model is simulated by Deform software,and the relative error of average grain size between simulation results and experiment results is smaller than 20%,which indicates that the stress-strain constitutive relation and dynamic recrystallization model can predict the experimental results well.

关 键 词：27MnCr5齿轮钢 本构关系 动态再结晶 数值模拟 平均晶粒尺寸 

分 类 号：TG111.7[金属学及工艺—物理冶金]